Sustaining- feiction-rollees in ships  blocks



UNITED STATES PATENT OFFICE.

JNO. ALLENDER, OF NEV LONDON, CONNECTICUT.

SUSTAINING- FRICTION-ROLLERS IN SHIPS BLOCKS.

Specification of Letters Patent No. 16,707, dated March 3, 1857.

To all who-m t may concern Be it known that I, JOHN ALLENDER, of New London, in the county of New London and State of Connecticut, have invented certain new and useful Improvements in Devices for Keeping Friction-Rollers in a Proper Position on the Sheaves of Ships Blocks; and I do hereby declare that the same are described and represented in the followin specication and drawings.

To ena le others skilled in the art to make and use my improvements I will proceed to describe their construction and use, referring to the drawings in which the same letters indicate like parts in each of the figures.

Figure l, is a plan of a pulley or sheave of a tackle or ships block provided with my improvements. Fig. 2, is a section through the line s e of Fig. l. Fig. 3, is a representation of one of the pieces placed between the friction rollers.

The nature of my improvements consists in the construction and arrangement of some pieces of metal or other material between the rollers to keep them in their proper places and permit them to turn freely, while the lianges on the axis, or on the interior of the circle in which they turn prevent them from moving endwise.

In the above mentioned drawings A, is a pulley such as is used in tackle blocks with a circular score B, around its periphery for the rope to lie in, as it passes around it. The hole through this pulley is made large enough to contain six friction rollers C, C, which turn in the score D, formed in the interior of the pulley between the flanges E, E, as represented in the drawing. The friction rollers C, O, are round pieces of metal with parallel ends just long enough to turn freely in the score D, and they are kept in their proper, and relative position, in regard to each other by the curved pieces of sheet metal F, F, placed in between them as represented: which are shown separate in Fig. 3. These pieces of sheet metal are cut the size required, and bent int-o the form represented, so that the two curved arms will yield when pressed toward each other, and spring open again when the pressure is removed, so that all the pieces F, F, and five of the rollers C, C, may be arranged in the score D, and the two pieces which have no roller between them, may be pulled apart far enough to insert the sixth roller endwise and place it in the score, where the rollers C C and pieces F, F, will mutually support each other in the score, until two of the pieces F, F, are pulled apart to remove one olthe rollers C, when necessary or desira e.

When there are flanges E, E, made upon the interior of the pulley a straight pin of a uniform size will answer. But if it should be desirable for any cause to dispense with these fianges, there may be some collars or flanges made on the pin which the pulley is to turn on which will prevent the rollers or gieces from getting out of place endwise.

r there may be one flange made in the center of pulley, and a score made in each roller and in each arm of the pieces between the rollers to embrace such iiange and retain them all in their relative position in the pulley. Or a score may be made in the apexes of the pieces E, E, to correspond with the proposed scores in the rollers and a collar or flange made on the pin on which the pulley turns to fit said scores, so as to hold the pieces and rollers in their proper and relative position as required.

It has been usual heretofore to make pivots on the ends of the rollers to turn in holes made in two rings, placed at each end of the rollers; or to make holes in the ends of the rollers, and pivots on the rings for the rollers to turn on, so as to hold them in their proper places. It is very eXpensive to make them in this way and a very little difference in the size of two rollers, that are both in service at the same time makes the larger impel the smaller, or the smaller retards the larger producing great friction on the pivots, so as to soon wear them out and require expensive repairs. Besides it makes the pulley turn hard. This defect is effectually remedied by my improvement, as the pieces between the rollers yield and spring together, so as to compensate for any dierence there'may be in the size of the rollers, so that one roller is not impelled nor retarded in its movement by another, as they are when the rings and pivots are used as above mentioned. Besides mine can be made far cheaper and they are better for the reason above stated and be- Cause they rarely require repairing, and when they do it Will not cost one tenth as much to renew the pieces E, E, as it Would to renew the rings and pivots of those heretofore used.

Although I have described my improvements as applied to the pulley of a tackle block; but I contemplate that they may be applied to such other purposes as may be desirable, and to axles which turn in boXes as Well as pulleys Which turn on aXles.

I believe I have described the construetion, operat-ion and use of my improvements, so as to enable any person skilled in the art to make and use them. I will JOHN ALLENDER.

Vitnesses JOHN GRACE, VILLIAM ALLENDER. 

